Check-valve for oil-wells



BBVANS."

Patented July 24, 1894.

Inven' tor.

(No Model.)

A CHECK VALVE FOB. OIL WELLS.

NITED STATES PATENT OFFICE.

EVAN EVANS, OF CHICORA, PENNSYLVANIA.

CH ECK-VALVE'IFOR OIL-WELLS.

SPECIFICATION forming part of Letters Patent No. 523,629, dated July 24, 1894. Application iiled August 15, 1,898. Serial No. 483,208. (No model.)

vention, such as will enable others skilled in the art to which it pertains to make and use it, reference being had to the accompanying drawings, which form tion.

My invention relates to an improved check valve for oil wells, and it consists in the novel means for securing the valve casing within Athe well tubing, and also in the means for confining thefcheck valve in said casing, as will be fully described hereinafterand especially referred to in the claims.

My invention is especially directed to the provision of a check valve embodyingr at once simplicity in construction and eectiveness in operation. Y

Referring to the accompanying drawings: Figure 1, is a sectional view of a well showing the relative position of the check valve and the other operating parts. Fig. 2, is a vertical sectional view of the check valve mechanism. Fig. 3, is a plan view of the same. Fig. 4, is a sectional view on line 4-4, of Fig. 2.

'A is the working barrel and B the standing valve of the ordinary or any preferred construction at its lower end.

C is the traveling valve, and D the sucker rod for operating the same extending upward through the tubing and the check valve, now to be described, arranged at a suitable distance above the standing valve. The said check valve structure consists of the cylinder E having a number of small perforations E', in its upper portion to pass the oil to the working barrel and a series of larger perforations F toward its lower end, while arranged between the perforations E and F, are the two openings F on opposite sides of the-cylinder for the purpose presently to be explained. The lower end of the cylinder is screw threaded interiorly and adapted to be run upward thereinto is the Abase portion G carrying a number of compressible wings H arranged vertically, which bind tightly the -Wall of the working barrel when in position therein, thus part of this specicaf holding the valve casing securely in position. The base portion is enlarged to formaiiange G and arranged above the same are a series of rings I which may be formed of leather or soft metal, upon which the lower end of casing E is rmly seated by having the base portion run tightly thereon, thus serving to eX- pand the said rings to fit tightly the said working barrel, and thus prevent any possible backward flow of oil around them.

Upon the interior of casing near its lower end is the annular Iiange K, and adapted to be conined between the same andthe upper end of the base portion is the reversible valve seat J. One end of this seat is perforated as shown at K. In wells of small capacity or iiow, there is but a small amount of oil below the foot valve, not enough in fact to afford the suction necessary to work properly, so that the walking beam and valves have an accellerated movement until the oil fills in sufficiently to flow. The movement of the said parts often becomes so rapid that when the oil is finally drawn the sudden action is liable to stop the valves and beam. The leak is provided for the purpose of allowing a backward flow all the while so that the pumping action may be regular and uninterrupted. The leak is not needed at all for large wells and the size thereof will be regulated according to the volume of oil produced; large openings being provided for wells of small flow and smaller openings for those flowing more freely. The said leak opening being constructed as here shown and described, has no tendency to cause wear upon the valve seat as is the case in check valves now in general use. As the annular shoulder K on said seat is clamped between the parts above referred to inyholding the seat in its proper position, it is apparent that either end of the seat may be utilized, one for a tight valve and the other for what I term a leak valve.

L is the valve proper which consists of the body or cylindrical portion M into the lower end of which is screwed the foot pieceNhaving a perfectly flat lower surface which is adapted to rest evenly upon the valve seat K, which latter is equally smooth and even so that a tight joint is formed through which no leaking is possible. This feature forms an IOO important part of my invention as by its use the passage is sealed at all times when the valve is down and thus washers and other similar packings are e'ectually dispensed with. -The footpiece and cylinder are also provided with smooth meeting ends or shoulders as shown, which ettect a tight joint and serve to keep said parts in perfect alignment. Cylindrical portion M is filled with packing of any desired kind which is confined in place by the removable capping N at its upper end and through this complete valve the sucker rod has a free movement, while the packing within the cylinder prevents any backward flow of oil.

The stroke or movement of the valve is regulated by nut O adapted to be run into the upper end of casing E, and which is adjusted to the desired point by the lock nut P, upon the upper end of said nut O. The surfaces of both nuts are so formed as to permit of the application of a wrench, as will be readily understood. Thus it will be seen that the lock nut may be so placed upon the nut O, as to permit the latter being run into the casing only a given distance, thus allowing the valve the desired amount of vertical play.

The two openings F' in casing E, are for the purpose of aiording a hold for a rod or other suitable tool when the casing is to be turned tightly down upon the base portion. Openings F are arranged in line with the upper end of the valve seat, so that the same may be inspected for the purpose of ascertaining whether or not the valve is properly seated thereon so as to permit of no leakage.

Having thus described my invention, what I claim, and desire to secure by Letters Patent, is

`1. In an improved valve, the combination of a casing, a reversible valve seat therein of less diameter than the casing and provided with a leak opening adjacentone end, a means for supporting the seat so that when the leak end of the seat is uppermost the leak opening will be unobstructed, and a valve, substam tially as shown and described.

2. In an improvedvalve, the combination of a recessed base, a valve seat adapted at either of its ends to fit therein, a lateral flange on the seat between its ends for resting on the upper end of the base and a transverse leak opening adjacent one end of the seat, whereby the leak Will be unobstructed when uppermost but which will be ettectually sealed by said base when the position of the seat is reversed, and a valve, substantially as shown and described.

3. In an improved valve, the combination of a vertically recessed base, a perforated casing secured to and of greater diameter than the base to which it is secured, a reversible valve seat on the base of less diameter than the said casing and adapted to be. supported partially above the base, a transverse leak opening near one end of the seat whereby the oil will flow freely therethrough when said end of the seat is uppermost being obstructed by either the base or casing but which Will be electually sealed when the position of the valve is reversed, and a valve, substantially as shown and described.

In testimony whereof I aix my signature in presence 0f two witnesses.

EVAN EVANS.

Vitnesses:

A. A. HoEH, T. G. MCLANAHAN. 

